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I have a 2003 Hyundai Accent with 166K on it. A couple of weeks ago I drove it and for an hour and parked, then after several hours I tried to start it and it wouldn't start. I had it looked at and found out that the fuel pump was not buzzing. I replaced it, it started and I drove it for a couple days then it died and didn't start again. It cranked but wouldn't start. To get it to start again, I had to spray starter fluid and then was able to drive it home. A couple of days later, while I was idling at a traffic light, it died. The engine cranked but it wouldn't start. I used starter fluid again and got it home. Once I use starter fluid it runs fine, like nothing is wrong with it. There is no fault code present. I replaced the fuel relay, fuel pressure regulator, ECU, fuel filter and spark plugs but I still have the same issue. What else do I need to replace? The car will start sometimes and sometimes it won't. Sometimes it will start fine without starter fluid and then other times when it randomly shuts off, I have to use it. I was going to replace the crank positioning sensor but since the car starts with starter fluid I think it may have something to do with the fuel.
Does anyone know what could be causing this. Any suggestions would be helpful.
 

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way to throw darts at the dart board. anything else you've replaced just because you can?

good bedtime reading for you:
http://www.hyundai-forums.com/174-do-yourself/232585-zero-104-automotive-diagnostics.html

the problem here is that there has been very little actual troubleshooting going on. we can assume the parts replaced are good, but we don't really know that if its used parts.

for no start issues, use F.A.S. - Fuel, Air, Spark

fuel - when the car is trying to start and fails (ie. turn it over a couple times) pull a spark plug after a few cranks. fuel on it? should be. there could be low system pressure due to a leak or blockage somewhere. you can also check if the injectors are actually opening during starting with the mechanics stethoscope.

air - check intake for blockages, if the air filter is blocked enough its possible.

spark - well i can assume that the plugs are fine now, provided they are the correct plugs. wires, no idea nor do we have any idea about the coils. spark plug indicator light. i got mine for $3 at wal-mart. an old timing light will work too if you have one. hold the light up to each wire and see if the plugs are actually working while someone cranks it for you.

the last one is electrical. you say no error codes, but that doesn't mean things are working right. if the ECU does not get power, nothing is going to happen but cranking when you turn the key and the ECU may not know any better. the above will reveal that with regards to spark.
 

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Since it does start with starter spray I suspect it would be fuel related & the fact you have replaced the fuel pump, regulator & filter narrows it down quite a bit. I suspect you may be experiencing fuel "vapour lock" or incorrect fuel pressure which can be caused by several different things & usually happens under hotter conditions, things to check;
1.) Fuel system pressure - do a leak down test, pressure should be stable between 40-50 psi after 15mins
2.) Evaporative emission canister(Charcoal canister) check for blockages in canister & lines
3.) Purge Solenoid Valve - check operation using 12v, valve should open & close

one other thing I have come across that has caused vapour lock is the use of Fuel Injection Cleaner additive once completely flushed out things returned back to normal, I can only think it has somehow affected an already faulty/failing part.
 
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